Employee Benefits Schedule of Expected Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 41
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	43
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	44
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	46
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	47
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	255
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	34
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	36
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	37
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	39
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	40
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	219
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	5
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	5
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	5
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	5
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	5
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	26
Non Qualified Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	2
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 10